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device_auth.go
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device_auth.go
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package oidc
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"github.com/giantswarm/microerror"
"github.com/giantswarm/kubectl-gs/v3/pkg/installation"
)
const (
deviceCodeUrlTemplate = "%s/device/code"
deviceTokenUrlTemplate = "%s/token"
DeviceAuthKeyClientID = "client_id"
DeviceAuthKeyScope = "scope"
DeviceAuthKeyDeviceCode = "device_code"
DeviceAuthKeyGrantType = "grant_type"
ErrorTypeAuthPending = "authorization_pending"
ErrorTypeSlowDown = "slow_down"
DeviceAuthScopes = "openid profile email groups offline_access audience:server:client_id:dex-k8s-authenticator"
DeviceAuthGrantType = "urn:ietf:params:oauth:grant-type:device_code"
nameClaimKey = "name"
)
type DeviceAuthenticator struct {
clientID string
authURL string
}
type DeviceCodeResponseData struct {
DeviceCode string `json:"device_code"`
UserCode string `json:"user_code"`
VerificationUri string `json:"verification_uri"`
VerificationUriComplete string `json:"verification_uri_complete"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
}
type DeviceTokenResponseData struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
IdToken string `json:"id_token"`
}
type ErrorResponseData struct {
Error string `json:"error"`
}
type JwtName struct {
Name string `json:"name"`
}
func NewDeviceAuthenticator(clientID string, i *installation.Installation) *DeviceAuthenticator {
return &DeviceAuthenticator{
clientID: clientID,
authURL: i.AuthURL,
}
}
func (a *DeviceAuthenticator) LoadDeviceCode() (DeviceCodeResponseData, error) {
formData := url.Values{}
formData.Add(DeviceAuthKeyClientID, a.clientID)
formData.Add(DeviceAuthKeyScope, DeviceAuthScopes)
result := DeviceCodeResponseData{}
response, err := http.PostForm(fmt.Sprintf(deviceCodeUrlTemplate, a.authURL), formData)
if err != nil {
return result, microerror.Maskf(cannotGetDeviceCodeError, err.Error())
}
responseBytes, err := bytesFromResponse(response)
if err != nil {
return result, microerror.Maskf(cannotGetDeviceCodeError, err.Error())
}
if err != nil {
return result, microerror.Maskf(cannotGetDeviceCodeError, err.Error())
}
err = json.Unmarshal(responseBytes, &result)
if err != nil {
return result, microerror.Maskf(cannotGetDeviceCodeError, err.Error())
}
return result, nil
}
func (a *DeviceAuthenticator) LoadDeviceToken(data DeviceCodeResponseData) (DeviceTokenResponseData, string, error) {
response, err := awaitDeviceToken(a.authURL, data)
if err != nil {
return DeviceTokenResponseData{}, "", err
}
userName, err := nameFromToken(response.IdToken)
if err != nil {
return DeviceTokenResponseData{}, "", microerror.Maskf(cannotGetDeviceTokenError, err.Error())
}
return response, userName, nil
}
func awaitDeviceToken(authURL string, data DeviceCodeResponseData) (DeviceTokenResponseData, error) {
loadTokenTicker := time.NewTicker(time.Duration(data.Interval*1000+250) * time.Millisecond)
defer loadTokenTicker.Stop()
expirationTimer := time.NewTimer(time.Duration(data.ExpiresIn) * time.Second)
defer expirationTimer.Stop()
responseCh := make(chan DeviceTokenResponseData)
errCh := make(chan error)
go func() {
for {
<-loadTokenTicker.C
loadResponse, loadErr := loadDeviceToken(authURL, data.DeviceCode)
if loadErr == nil {
responseCh <- loadResponse
return
} else if !IsAuthorizationPendingError(loadErr) && !IsTooManyAuthRequestsError(loadErr) {
errCh <- loadErr
return
}
}
}()
go func() {
<-expirationTimer.C
errCh <- cannotGetDeviceTokenError
}()
var response DeviceTokenResponseData
var err error
select {
case response = <-responseCh:
break
case err = <-errCh:
break
}
return response, err
}
func loadDeviceToken(authURL, deviceCode string) (DeviceTokenResponseData, error) {
formData := url.Values{}
formData.Add(DeviceAuthKeyDeviceCode, deviceCode)
formData.Add(DeviceAuthKeyGrantType, DeviceAuthGrantType)
response, err := http.PostForm(fmt.Sprintf(deviceTokenUrlTemplate, authURL), formData)
if err != nil {
return DeviceTokenResponseData{}, microerror.Maskf(cannotGetDeviceTokenError, err.Error())
}
responseBytes, err := bytesFromResponse(response)
if err != nil {
fmt.Println(err)
return DeviceTokenResponseData{}, microerror.Maskf(cannotGetDeviceTokenError, err.Error())
}
if response.StatusCode > 200 {
result := ErrorResponseData{}
err = json.Unmarshal(responseBytes, &result)
if err != nil {
return DeviceTokenResponseData{}, microerror.Maskf(cannotGetDeviceTokenError, err.Error())
}
switch result.Error {
case ErrorTypeAuthPending:
return DeviceTokenResponseData{}, microerror.Maskf(authorizationPendingError, result.Error)
case ErrorTypeSlowDown:
return DeviceTokenResponseData{}, microerror.Maskf(tooManyAuthRequestsError, result.Error)
default:
return DeviceTokenResponseData{}, microerror.Maskf(cannotGetDeviceTokenError, result.Error)
}
}
result := DeviceTokenResponseData{}
err = json.Unmarshal(responseBytes, &result)
if err != nil {
return DeviceTokenResponseData{}, microerror.Maskf(cannotGetDeviceTokenError, err.Error())
}
return result, nil
}
func bytesFromResponse(response *http.Response) ([]byte, error) {
defer func() {
_ = response.Body.Close()
}()
bytes, err := io.ReadAll(response.Body)
if err != nil {
return nil, microerror.Mask(err)
}
return bytes, nil
}
func nameFromToken(token string) (string, error) {
parsedToken, _, err := new(jwt.Parser).ParseUnverified(token, jwt.MapClaims{})
if err != nil {
return "", microerror.Maskf(cannotParseJwtError, err.Error())
}
var claims jwt.MapClaims
var ok bool
if claims, ok = parsedToken.Claims.(jwt.MapClaims); !ok {
return "", microerror.Mask(cannotParseJwtError)
}
var nameClaim interface{}
if nameClaim, ok = claims[nameClaimKey]; !ok {
return "", microerror.Mask(cannotParseJwtError)
}
var name string
if name, ok = nameClaim.(string); !ok {
return "", microerror.Mask(cannotParseJwtError)
}
return strings.ToLower(strings.ReplaceAll(name, " ", ".")), nil
}